Often referred to as the "stress hormone" because of its involvement in the body's stress response, cortisol is the principal steroid hormone produced by the adrenal cortex. It increases blood pressure and blood sugar levels and can act as an immunosuppressant. Hydrocortisone, or synthetic cortisol, is used to treat a number of conditions, including inflammation, allergies, collagen diseases, and adrenocortical insufficiency. In humans, cortisol levels peak at what time of day?

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